Okay.. than the google must be at the top. And according to that http:// search on google we're having:
2. - Microsoft
3. - Altavista (hey, another search engine)
4. - Yahoo!
5. - World Wide Web Consortium (W3C)
6. - MyExcite
7. - CNN.com
8. - Lycos
9. - Amazon.com
10. - WebCrawler
..with the google being at NO. 1.
So, according to this, it's true that Microsoft (besides google) is at the top and Amazon ISN'T being only at the 9th place.
But hey.. it's only according to google. It doesn't have to be the real deal since sites can still gain some traffic from other search engines and refferers.